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Chapter 3: Problem 57
If one considers just the representative elements, how many groups would the periodic table have?
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Bromine exists as only two isotopes in nature, \({ }_{35}^{79} \mathrm{Br}\) (atomic mass \(78.918336\) amu, \% natural abundance \(=50.69 \%\) and \({ }_{35}^{81}\) Br (atomic mass \(80.916289\) amu). (a) What is the percent natural abundance for \({ }_{35}^{81} \mathrm{Br}\) ? (b) Calculate the atomic mass of the naturally occurring mixture of isotopes.
Why is the atomic mass of carbon not listed as 12 on the periodic table if the universal standard is that \({ }_{6}^{12} \mathrm{C}\) has an atomic mass of exactly 12 amu?
Write the full atomic symbol for the only atom that has its mass number equal to its atomic number.
Scandium (Sc) is a metal that tends to lose three electrons. Copper (Cu) and zinc \((Z n)\) are also metals that tend to lose one and two electrons, respectively. Knowing this, explain why the first group in the transition metals is numbered IIIB, whereas the last two groups in the transition series are numbered IB and IIB, respectively.
A heated gas made up of individual atoms gives off a line spectrum when the emitted light is passed through a prism. How does a line spectrum differ from a continuous spectrum?
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